A boy leaves his house at 9:30 a.m for this school..The school is 2 km away and classes start at 10:00a.m.If he walks at a speed of 3 km/h for the first kilometre,at what speed should he walk the second kilometre to reach just in time.
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he may took 15 minutes for 1 km he tooks 30minutes to cover 2 km
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